/* MOOSSin portal stylesheet.
 *
 * Hand-written, project-original, no framework and no external request: the
 * page must stay inside ADR-0004's `default-src 'none'` with `style-src 'self'`,
 * so there is no @import, no webfont, and no url() reaching off-origin.
 *
 * The colour tokens below were chosen against measured WCAG contrast, not by
 * eye. Ratios on the near-white page background:
 *   ink 15.75:1, muted 7.67:1, moss 6.19:1, moss-strong 8.67:1, line 3.54:1.
 * `--moossin-line` clears 3:1 because a card boundary is a non-text element
 * that has to be perceivable; the softer grey-green that looked nicer measured
 * 1.48:1, which is decoration pretending to be structure.
 *
 * Focus rings use `--moossin-moss`, never the line colour. A focus indicator is
 * the one thing a keyboard user cannot do without.
 */

:root {
  --moossin-page: #fbfcfa;
  --moossin-surface: #f1f4ef;
  --moossin-ink: #1c221d;
  --moossin-muted: #4a544b;
  --moossin-moss: #2f6b3f;
  --moossin-moss-strong: #24532f;
  --moossin-line: #7c8a78;

  --moossin-space-1: 0.25rem;
  --moossin-space-2: 0.5rem;
  --moossin-space-3: 1rem;
  --moossin-space-4: 1.5rem;
  --moossin-space-5: 2.5rem;

  --moossin-measure: 38rem;
  --moossin-radius: 0.5rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 var(--moossin-space-3);
  background: var(--moossin-page);
  color: var(--moossin-ink);
  /* System stack only: no webfont means no licence obligation and no load cost. */
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC",
    "Microsoft JhengHei", sans-serif;
  /* Unitless line-height and rem sizing keep 200% text zoom from clipping. */
  line-height: 1.7;
  font-size: 1rem;
}

h1,
h2,
h3 {
  line-height: 1.35;
  text-wrap: balance;
}

a {
  color: var(--moossin-moss);
}

a:hover {
  color: var(--moossin-moss-strong);
}

/* A single focus rule for everything focusable, so no control can lose its
 * indicator by being styled later. */
a:focus-visible,
:focus-visible {
  outline: 3px solid var(--moossin-moss);
  outline-offset: 2px;
  border-radius: var(--moossin-radius);
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  position: static;
  display: inline-block;
  margin: var(--moossin-space-2) 0;
}

.masthead,
main,
.colophon {
  max-width: 60rem;
  margin: 0 auto;
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  gap: var(--moossin-space-2) var(--moossin-space-4);
  align-items: baseline;
  justify-content: space-between;
  padding: var(--moossin-space-4) 0;
  border-bottom: 1px solid var(--moossin-line);
}

.masthead__brand {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.masthead__nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--moossin-space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero {
  padding: var(--moossin-space-5) 0 var(--moossin-space-4);
}

.hero h1 {
  max-width: var(--moossin-measure);
  margin: 0 0 var(--moossin-space-3);
  font-size: clamp(1.6rem, 1.2rem + 2vw, 2.4rem);
}

.hero__lead {
  max-width: var(--moossin-measure);
  margin: 0 0 var(--moossin-space-4);
  color: var(--moossin-muted);
}

.hero__action {
  margin: 0;
}

.button {
  display: inline-block;
  padding: var(--moossin-space-2) var(--moossin-space-4);
  border-radius: var(--moossin-radius);
  background: var(--moossin-moss);
  color: var(--moossin-page);
  text-decoration: none;
}

.button:hover {
  background: var(--moossin-moss-strong);
  color: var(--moossin-page);
}

.sites,
.principles,
.about {
  padding: var(--moossin-space-4) 0;
}

.sites h2,
.principles h2,
.about h2 {
  margin: 0 0 var(--moossin-space-3);
  font-size: 1.35rem;
}

.sites__list {
  display: grid;
  gap: var(--moossin-space-3);
  /* Cards never drop below a readable width, so the grid collapses to one
   * column rather than squeezing at 320px. */
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
}

.site-card {
  display: flex;
  flex-direction: column;
  gap: var(--moossin-space-2);
  padding: var(--moossin-space-4);
  border: 1px solid var(--moossin-line);
  border-radius: var(--moossin-radius);
  background: var(--moossin-surface);
}

.site-card__title {
  margin: 0;
  font-size: 1.1rem;
}

.site-card__description {
  margin: 0;
}

.site-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--moossin-space-1) var(--moossin-space-3);
  margin: 0;
  color: var(--moossin-muted);
  font-size: 0.9rem;
}

.site-card__host {
  /* The destination host, shown so a visitor knows where the link goes. */
  font-family: ui-monospace, "Cascadia Mono", "Consolas", monospace;
  word-break: break-all;
}

.site-card__external::before {
  content: "↗ ";
}

.site-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--moossin-space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.9rem;
}

.site-card__tag {
  padding: 0 var(--moossin-space-2);
  border: 1px solid var(--moossin-line);
  border-radius: var(--moossin-radius);
  color: var(--moossin-muted);
}

.site-card__action {
  margin-top: auto;
  padding-top: var(--moossin-space-2);
  font-weight: 600;
}

.principles__list {
  display: grid;
  gap: var(--moossin-space-3);
  margin: 0;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 16rem), 1fr));
}

/* Each term is grouped with its description in a `div`, which HTML allows
 * inside a `dl`. Without the grouping the grid lays out `dt` and `dd` as
 * independent cells, and at any width that fits an odd number of columns the
 * terms stop lining up with their descriptions -- correct at the width you
 * happen to test, wrong at the next one. */
.principle {
  min-width: 0;
}

.principle dt {
  font-weight: 700;
}

.principle dd {
  margin: var(--moossin-space-1) 0 0;
  color: var(--moossin-muted);
}

.about p {
  max-width: var(--moossin-measure);
  margin: 0 0 var(--moossin-space-3);
}

.colophon {
  padding: var(--moossin-space-4) 0 var(--moossin-space-5);
  border-top: 1px solid var(--moossin-line);
  color: var(--moossin-muted);
}

.colophon__brand {
  margin: 0 0 var(--moossin-space-1);
  font-weight: 700;
}

.colophon__note {
  margin: 0;
}

/* Only hover and focus feedback exists, and even that is dropped on request. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}